Fertilization of human eggs usually takes place in the _____
A) ovary
B) uterus
C) vagina
D) oviduct
E) cervix
Answer: D
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Which structure is found in the nucleotides of DNA but not in RNA?
A) a sugar B) a phosphate group C) deoxyribose D) a nitrogen-containing base
Each of the following is correct about cholera and its effect on G-protein–adenylyl cyclase activity except
A) Vibrio cholera bacteria colonize the gut. B) Cholera toxin is secreted by Vibrio cholera bacteria. C) Intestinal cells infected with cholera toxin import abnormally high levels of salts and fluids into the bloodstream. D) Cholera toxin alters Gs? so that it no longer hydrolyzes GTP. E) Intestinal cells infected with cholera toxin maintain abnormally high cAMP levels.
For the hipAB TA module in Escherichia coli,
a. HipB is the toxin. b. HipA is the antitoxin. c. Lon degrades HipB, allowing HipA to inhibit translation and leading to persistence. d. HipA degrades Lon, allowing HipB to inhibit translation and leading to persistence.
The infectious stage of chlamydiae is called a(n) ________ body.
A. oogonial B. contagious C. elementary D. reticulate